West Sussex · England
Forge Wood Sand Mastic
Traditional burnt sand mastic around sash and case windows and doors in stone and brick in Forge Wood, with a 12-month guarantee on every job. Call for a quick quote.
- Window mastic to renew ahead of painting
- Mastic dropping out of the joint
- Gaps round a timber door in stone or brick
Forge Wood: your questions answered
Will you come out to Forge Wood?
Yes, Forge Wood is covered. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Is Forge Wood in your area for sand mastic?
Yes. Our work covers London and the South East, and Forge Wood is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we will give you a clear quote.
How long does the job take?
As a guide, most jobs take a few hours per window, depending on the condition of the joints. Larger jobs naturally take longer.
Can you quote for more than one area?
Of course. Doing several areas at once is usually more efficient.
What should I tell you?
The location, the problem and the rough size of the job. Photos by email help too.
What is sand mastic?
It’s a mix of sand and a linseed-oil-based binder. It’s built up in the joint by hand and shaped to suit the surround.
Can you seal over the old sealant?
No, and we never do. It can look neat for a few weeks, but the new layer lifts away from the old one. The old sealant has to come out completely.
I rent my home. Can I book you?
Of course. Check with your landlord; we can send the quote to them too.
Sand mastic in Forge Wood
Across Forge Wood, we renew sand mastic around sash and case windows. Each joint is raked out, prepared and pointed by hand for a neat, traditional finish. If you’re dealing with old cement repairs round a window that have failed and draughts and rain around sash boxes, we can help, on stone surrounds, period & listed homes and tenement windows alike.
Homes around Forge Wood range from older properties to newer houses, and their windows range just as widely. Each frame material needs the right sealant against the right wall.
Our work is backed for twelve months, in Forge Wood and everywhere else we cover.
- Location
- Forge Wood (RH10, RH6)
- Region
- West Sussex
- Guarantee
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Also near Forge Wood
More services for Forge Wood
Work for landlords, hotels and businesses
Whether it’s one flat or a portfolio, the work is the same standard: the old material taken out, careful preparation and a 12-month guarantee.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Different surfaces, different methods
Tenement and terrace windows
Where a building is shared, window work may involve neighbours so it’s worth checking responsibilities.
Sash and case windows
The box of a sash and case window sits in the stone or brick opening. The gap round it is pointed with sand mastic.
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Don’t run silicone over sand mastic
- Clear gutters so water doesn’t pour onto the windows
- Plan mastic work ahead of painting
- Check with your local planning authority if your home is listed
Avoid painting over the new mastic, which is the traditional advice. Ask us before any decorating around it.
Good mastic helps keep the frame dry. Once it fails, water can sit against the timber, which can lead to rot.
Why deal with it now?
Not every filler suits an old window surround. Sand mastic is the like-for-like choice, which can matter on listed and conservation-area homes. Homes in smaller places like Forge Wood can face more weather, and failed outside joints let damp into walls. Inside, a split seal lets water into floors and panels just as it would anywhere.
What it costs depends on how much there is to do, how hard the old material is to remove and how easy the joints are to reach. We give a clear quote before we start.
Why Forge Wood customers choose us
- A 12-month guarantee on all work
- Fully insured
- Rated 4.9 stars on Google
- We leave the area clean and tidy
Take a look at what affects the cost or what customers say.
Honest limits
Honest advice matters more to us than a booking, so here’s what sealant cannot fix:
- Whether work needs listed building consent
- Sash cords, weights and draught-proofing of the sashes
- Putty and glazing repairs
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Sash and case windows
- Period & listed homes
- Brick reveals
- Tenement windows
- Stone surrounds
- Timber door frames
When to call us in Forge Wood
Decorating can disturb tired mastic. It’s often found when windows are being prepared for paint, which is a good time to renew it.
The most common problems we see are:
- Patchy fillers round a sash window
- Modern sealant on a period surround
- Mastic that needs renewing before redecorating
- Crumbling sand mastic round a window
For site and facilities teams at buildings such as Forge Wood Primary School, its window and door frames need their mastic kept sound, just like a home’s.
What your quote should include
- What insurance they hold
- Who does the work, and how experienced they are
- What happens if they find a problem under the old sealant
- What the quote includes, VAT included or not
What happens on the day
At the end, we look at the finished work together. The work normally takes a few hours per window, depending on the condition of the joints, depending on the size of the job. A visit to Forge Wood is planned like any other: the time, the access and where to park are agreed in advance. If the work is outside, the weather plays a part, as sealant needs a dry surface.
- We check each window surround and the condition of the joint.
- We rake out the old mastic and clean the joint.
- Large voids are packed out.
- We point the joint with sand mastic by hand.
- We finish the mastic to a tidy line.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Mention any parking rules near the property
- Try not to wet indoor joints just before the visit
Get a quote
Call for a quick quote, or email us if that’s easier. Tell us about the joints that need doing and we’ll explain what’s involved.
Advice
Forge Wood homes and the weather
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
If you let a flat or house near Three Bridges station, any sash windows need sound mastic to keep draughts and rain out.
Forge Wood is about 2 miles north-east of Crawley, in West Sussex. Homes, rented property, offices and hotels in Forge Wood is covered for sand mastic, old or new, large or small. Every job comes with our one-year guarantee. Across West Sussex, we cover 371 places, Forge Wood among them.
Our applicators cover all of the RH10 and RH6 postcode area for sand mastic. You will find streets such as Moore Road, Steers Lane and Radford Road, all of which we cover. Neighbouring places we cover for sand mastic include Tinsley Green (1 mile north), Pound Hill (1 mile south), Shipley Bridge (1 mile north-east), Copthorne (1 mile east) and Three Bridges (1 mile south). Larger places within reach include Horsham (9 miles south-west), Haywards Heath (10 miles south), Burgess Hill (12 miles south), East Grinstead (6 miles east), Broadfield (4 miles south-west) and Billingshurst (15 miles south-west).
What’s near Forge Wood
Around Forge Wood, our work takes us to homes and buildings near Worth Park Gardens, The Greyhound pub and The Gatwick School and the streets around them. Forge Wood’s nearest station is Three Bridges station, roughly 1.4 miles south. A little further out are Crawley Museum (2.1 miles south-west) and Langley Green Hospital (1.7 miles west). Open spaces near Forge Wood include Tilgate Lake.